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Inhibitor, preparing method and use thereof

A technology of inhibitors and corrosion inhibitors, which is applied in the field of anti-corrosion on the surface of metal materials, can solve the problems of limited solubility, easy emulsification, inconvenient use, etc., and achieve the effects of significant inhibitory effect, good solubility, and convenient use

Inactive Publication Date: 2006-11-08
SINOPEC LUOYANG PETROCHEM ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wherein the corrosion inhibitor disclosed in USP4404167 has limited solubility in water, is easy to emulsify, and is inconvenient to use: the corrosion inhibitor disclosed in USP5151220 is an oil-soluble corrosion inhibitor, and the usage amount is less, and the inhibition efficiency reaches 95%, but there is a dosage It is not easy to grasp, the injection amount is too small to form a continuous protective film on the surface of the equipment and pipelines behind, and the injection amount is large and may contaminate the medium; the corrosion inhibitor disclosed in USP0020001536 is used in a specific environment to inhibit alkane Corrosion of base alcohol amine, hot carbonate solution, diglyme and other solvent gas systems, inhibition of corrosion of equipment in contact with amine-based solvents and acid gases such as hydrogen sulfide and carbon dioxide, not suitable for H 2 S-H 2 O system

Method used

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  • Inhibitor, preparing method and use thereof
  • Inhibitor, preparing method and use thereof
  • Inhibitor, preparing method and use thereof

Examples

Experimental program
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Effect test

example 1

[0029] Example 1: 1) prepare corrosion inhibitor:

[0030] 170 grams of oleic acid, 90 grams of triethylenetetramine, and 50 grams of xylene were simultaneously added to a four-necked flask equipped with a thermometer, condenser, water separator, stirrer and heating device. Heating to 150°C to start distillation, after constant temperature for 3 hours, increase the temperature to 200°C at 10°C / h, and keep constant temperature for 5 hours to condense the binary system into an oil-soluble intermediate containing bicyclic imidazoline; take 100 grams of intermediate, add 40 grams of ethanol, slowly add 20 grams of acrylic acid under stirring conditions, continue to stir for 1 hour after the addition, so that it is converted into a corrosion inhibitor.

[0031] II) Preparation of Inhibitors

[0032] The corrosion inhibitor prepared in step I) is compounded with zinc sulfate at normal temperature and pressure, wherein the corrosion inhibitor accounts for 95% by weight to obtain the...

example 2

[0033] Example 2: the same preparation method as Example 1, except that oleic acid is replaced by naphthenic acid with an average molecular weight of about 260.

example 3

[0034] Example 3: The same preparation method as Example 1, except that oleic acid is replaced by linoleic acid, and triethylenetetramine is replaced by tetraethylenepentamine.

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Abstract

The present invention relates to an inhibitor, which is composed of 90-97% by weight of corrosion inhibitor and 3-10% by weight of anti-corrosion accelerator, wherein the general structural formula of the corrosion inhibitor is shown in formula (1): see right In the formula, R is a linear or branched alkane group or alkene group, cycloalkane group or cycloalkene group with 8 to 30 carbon atoms, and the structural formula of R' is -CH 2 ) 2 [NH(CH 2 ) 2 � n1 , wherein n1 is an integer of 0 to 4; the anticorrosion accelerator is zinc salt of organic acid or zinc salt of inorganic acid; in addition, the present invention also relates to the preparation method and application of the inhibitor. This inhibitor is used for H 2 S-H 2 In the system of O, when using, the inhibitor of the present invention is added to the 2 S-H 2 O's system. The inhibitor of the present invention not only has the characteristics of film-forming property, temperature resistance, difficulty in emulsification, and resistance to changes in pH value of the oil-soluble inhibitor, but also has good solubility and dispersibility of the water-soluble inhibitor, and is convenient to use.

Description

technical field [0001] The invention belongs to metal material surface anticorrosion technology, in particular to an inhibitor and its preparation method and application. Background technique [0002] With the deterioration of domestic crude oil and the increase of imported high-sulfur crude oil, the corrosion problems of refining and chemical enterprises are becoming more and more serious, which makes the corrosion problems that are not the key protection parts have attracted more and more attention, such as the condensing cooling system of the desulfurization device regeneration tower, liquefied petroleum Gas tanks, liquid hydrocarbon storage tanks and hydrogenation units, etc. The corrosion of this type of device is mainly caused by CO 2 -H 2 S-H 2 O, H 2 S-H 2 O corrosion. In this environment, steel produces general corrosion, hydrogen bulging, sulfide stress corrosion cracking and other corrosion. There are generally two ways to solve this kind of corrosion at ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
Inventor 王菁辉杨金辉郭鹏
Owner SINOPEC LUOYANG PETROCHEM ENG CORP